Hoisting machine



June 29 ,1926. 1,590,790

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' 49 is continued in the form of a verticalcollar 33 is provided with a similar pair of cam projections. Secured to theinner faces of the pillow blocks 13 and 14 are a pair of collars 35 and 36, respectively, the inner annular'faces of which are provided with diametrically opposite cam points or projections, such as 36 and 36, Fig. 4, designed for co-operation with the corresponding cam points of the collars 33 and 34 to effect the engagement of therespective clutch members 27, 23 and 28', 24 respectively, in the manner hereinafter described. The collars 35 and 36 are adjustably secured in fixed position relatively to the pillow blocks to which they are attached by means of clamp bolts 37 and 38 engaged with arc-shaped slots formed in segmental extensions 39 and 40 depending from the lower edges of said collars.

Fast with the collars 33 and 34 are radial arms 41 and 42, respectively, (Fig. 1) terminating in segmental racks 43 and 44, respectively, through the actuation of which in the manner hereinafter described said cam faced collars 33 and 34 are oscillated simultaneously to produce opposite movements of the upper and lower male members of the clutches. J ournaled in the standard 11 midway between the clutch shafts 15 and 16 is a short rock-shaft 45 (Fig. 6), on the inner end of which is a segment gear 46, which meshes with both of the segment gears 43 and 44. Fast on the outer or opposite end of the shaft 45 is an operating lever 47 terminating at its upper end in a handle 47 secured to the outer face of the standard 11, opposite the bearing of the shaft 45, is a fixed quadrant 48 having a central notch 48*, with which cooperates the lower end of a locking rod 49 mounted to slide vertically in a guide lug 50 on the inner face of the lever 47, the upper end of this rod being pivoted to the lower end of a release lever 51 pivoted to the main lever 47. The locking rod 49 is provided, just above its lower end, with a lateral extension 49 which passes through a vertical slot 47 formed in the lever 47. Thence the lateral extension connecting the opposite sides of a divided housing or guide 52 also faston the outer end of the shaft 45 and partially embracing the lower end portion of the lever 47. On the lower end of the extension 49 is a pin 49, on which is hung a bent rod 53, the lower end of which is secured to a latch-bar 54, pivoted at its inner end at 55 to the pillow block 13, the outer end of said latch-bar 54 having a hook 54 adapted to co-operate with a shoulder on a foot-operated brake lever as hereinafter described. The pin 49 is so situated as to be in line with the center or axis of the rock-shaft when the rod 49 is raised out of engagement with the notch of the quadrant as hereinafter described.

57 (Fig. 2) designates an electric motor, the armature shaft 57 of which carries a pinion 58 meshing with the gear 21. Gears 29 and 30, constituting elements of the sliding male clutch members, both mesh with a large gear 59 keyed to the drum-shaft 20. Integral or otherwise fast with the large gear 59 is a brake wheel 60. Loose on the shaft is a winding-drum 61, and also loose on said shaft is 'a stepped grooved cabledriving sheave 62. (lo-operating with the brake wheel 60 is a brake comprising a pair of brake shoes 63 (Fig. 1) mounted on the ends of a yoke 64 which latter in turn is centrally seated on a brake-lever 65 that is pivoted at one end at 66 to a block 67 on the base 10 and at its other end rests upon the short arm 68 of a lever 69 that is sleeved on a shaft 70 mounted in and between the standards 11 and 12 (Fig. 2). Pivoted on one end of the shaft 70 is a foot lever 71 that is adjustably connected to the lever 69 by a clamp bolt 72 extending through an arc-shaped slot 73 in the lever 69. The in nor end of the foot lever 71 is upwardly and reversely curved, as .shovvnin 1, and terminates in a shoulder or hook 71 that co-operates with the hook 54 of the arm 54. A compression spring 74 maintains the engagement of the hooks 54 and 71 and,

'when said hooks are disengaged, acts to throw the foot lever upwardly and simultaneously release the pressure. on the brake. On the adjacent faces of the drum 61 and sheave 62 are a pair of clutch members 75 and 76, respectively, between which is a double faced clutch member 77 that is splined on the drum-shaft 20, as best shown in Fig. 8. This slidable clutch member 77 is encircled by a strap 78 carrying lateral pins 79 that are engagedby the slotted arms of a forked clutch shifting lever 80. This latter is fast at its lower end on a rock-shaft 81 journaled in a pair of bearings 82. Faston one end of the rock-shaft 81 is an up wardly extending clutch shifting lever 83 terminating in a handle 83 (Fig. 7). By shifting the lever 83 in one direction the drum 61 is made fast with the shaft 20 while the sheave 62 is simultaneously disengaged fromtthe shaft, and by shifting the lever in the opposite direction the sheave 62 is engaged with the shaft and the drum 61 is simultaneously disengaged. When the lever is in its central or intermediate position, both the drum and the sheave are freed from the shaft. 7

It is desirable that when either the drum or the sheave is thus clutched to the shaft the other shall be held stationary. This result is effected simultaneously with the shifting of the clutch and through the movements of the. clutch shifting lever 83 by the mechanism best shown in Figs. 7 and 8, wherein it will be seen that the periphery of the sheave 62 and the periphery of the adjacent head of the drum 61 are disposed directly above a pair of brake shoes 84- and 85, respectively, which are carried by arms 86 and 87 pivoted at their outer ends to lugs 88 on the base 10. The brake shoes are normally raised into braking engagement with the sheave and drum by strong; compression springs 89 underlying the free ends of the brake arms 86 and 87. Fast on the shaft 81 is a yoke 90 (Fig. 8), the ends of which overlie the brake arms 86 and 87. In the central or intermediate position of the clutch shifting lever 83 the yoke 90 is horizontal and depresses both of the arms 86 and 87 sufficiently to disengage the brake shoes from the drum and sheave. hen, however, the clutch is shifted to connect the sheave 62 with the drum-shaft, the brake 84 of the sheave is depressed and the brake 85 of the drum is released and instantly applied to the latter. When the lever is shifted to connect the drum to the shaft, the brake shoe 85 is depressed and the brake shoe 84 is released and instantly engages the sheave. It will thus be seen that the ins stant either the drum or sheave is clutched to the shaft, its brake is locked in release position and the brake of the other is applied. At 91, I have indicated an ordinary electric controller through which the current is supplied to and cut off from themotor 57.

The machine herein shown and described is adapted to be employed as a simple hoisting machine in a great variety of situations where hoisting operations are required, in which cases the hoisting drum 61 is used, the operating cable beinp; wound and unwound thereon in a manner common in all hoisting machines employing; a cable receiving drum of this sort. The machine is also extensively used to operate material elevators in connection with the erection of buildings where a pair. of elevating platforms or carriers are employed and so connected to the hoisting apparatus as to travel simultaneously in opposite directions. In such cases a driving cable is passed one or more times around the sheave 62 and attached at its opposite ends to the two elevating platforms or carriers respectively.

The operation of the machine is believed to be fully evident from the foregoing description of its structure and organization, and from the. disclosure it will be apparent that I have modified and improved the hoisting machine of the patent hereinabove referred to to obtain greater flexibility and.

enable the machine to beemployed to drive either the winding; drum or cable sheave, according to the. particular job in hand, independently of the other, and at the same time looking the other in place, which is sometimes desirable, where the two operations may be alternately performed with greater or less frequency on one and the same job.

I claim:

In a hoisting machine, the combination with a driving shaft, and power-actuated mechanism for rotatingsaid shaft, of a pair of cable-windingelements both loose on said shaft, driven clutch members on the opposed faces of said elements, a driving clutch member splined on said shaft between said driven clutch members, a rock-shaft, a clutch shifter fastthereon engaged with said driving clutch member to shift the latter between said driven clutch members, an operating handle fast on said rock-shaft, pivot ed arms carrying brake shoes engageable with the peripheries of said cable-actuating elements, springs urging said arms in a direction to engage said brake shoes with said cable-actuating elements, and a transverse yoke fast on said rock-shaft and at its ends overlying said arms and operating, when said handle is swung in either direction, to retract one of said brake shoes and permit the other to be applied by its spring.v

ALEXANDER n. WILSON. 

